Crusher.



J. P. FOX.

CRUSHER.

APPLICATION FILED MAR.B,1911.

1,007,935. Patented N0v.7, 1911.

L, If INVENTOR. WW

)7 ATTORNEY.

JOHN P. FOX, OF PITTSBURGH, PENNSYLVANIA.

cRU'sHER.

Specification of Letters Patent.

Application filed March 8, 1911.

Patented Nov. '7, 1911. Serial No. 613,045.

To all whom it may concern:

Be it known that 1, JOHN P. Fox, a sub ject of Great Britain, residingat Pittsburgh, in the county of Allegheny and State 7 of Pennsylvania,have invented new and shafts, provided preferably with eccentrics forconverting the rotary motion of the actuating-shafts into reciprocatoryor oscillatory motion, the two actuating shafts being connected togetherso as to turn together in the desired directions. Crushers of the typeshown are subject to heating and rapid wear,

owing to the very heavy pressures that they have to withstand and to thehigh speeds at which they usually run. By properly distribut-in thedriving power through two separate eccentrics or their equivalents, amuch more durable machine is obtained, which will crush about twice theusual amount of stone before wearing out its working parts.

Another object of my invention is to prevent the passage through thejaws of obj ects larger than a predetermined size.

Referring to the accompanying drawing,

' Figure 1 shows, diagrammatically, a vertical section takentransversely of the jaws. Fig. 2 is a plan of the gage or stop at thebottom of one of the jaws.

On the drawing, A and B represent two I oscillatory or pivoted crusherjaws inclined downwardly and toward each other. The jaw A oscillates onthe pivot or rod a which is at or near the upper end of the jaw A, andthe jaw B oscillates on the pivot or rod 7), which is at or near thelower end of the jaw B.

C and D are two parallel driving, or actuating, shafts, the shaft Cbeing at the right of the jaw A and opposite the lower portion thereof;and the shaft D at the left of the jaw B and opposite the upper portion.thereof. The shaft C has thereon the eccentric E on which rides theeccentric collar or sleeve F provided with the arm f with its free endworking in the notch a in the rear side of the lower portion of the jawA. The

flow of stone.

shaft D has thereon the eccentric G on which rides the eccentric collarH, provided with the arm h with its free end working in the notch Z) inthe rear side of the upper portion of the jaw B. The shafts C and D areprovided with the spur gear wheels I and J, respectively, which aregeared together. It is to be understood, however, that various othermeans for converting the rotary motion of the shafts into theoscillatory motion of the jaws, and for causing the shaftsto rotatetogether may be devised.

K represents a shelf or gage located beneath the end of the aw A, or thejaw with its swinging lower end, and secured to the bracket or supportL. Preferably the gage K will have teeth 7 as shown in Fig. 2 and thelower face of the shelf will be beveled so as to provide a sharp forwardedge and offer as little resistance as possible to the In the ordinarystone crusher, if it is desired that stone not larger than one inchshall be discharged, it is necessary to set the aws so that theirgreatest distance apart at the bottom shall be one inch. Under theseconditions it is hardly practical to give the jaw a stroke of more thanabout three-eighths of an inch, causing the distance apart of the jawsat the bcttom to vary from one inch to fiveeighths of an inch. With mycrusher, if it is desired to crush stone so that no stone larger thanone inch shall be discharged, I provide such a size of gage K that thespace between it and the opposing jaw shall be one inch. By providingthe gage, I can make the space between the jaws at the bottom workbetween the limits of one and three-quarters inches andfifteen-sixteenths of an inch, and thereby obtain far greater capacity.

In a stone crusher a large stroke is desirable. A part of the stroke inany crusher does not accomplish useful work, because absolute rigidityof the machine cannot be obtained, lost motion exists during the wearand play of the working parts, and stones at first generally present tothe jaws only a few projecting faces or points, which are during thefirst portion of the travel of the jaws crushed down without breakingthe stone. These causes absorb a far greater percentage of the motion ofa small stroke than a large one. Also, as the pressure on the jaws isnearly the same for a small stroke as for a large one, the work lost inlower portion, a separate driving shaft for friction of the Workingparts is not much more for a large stroke than for a small one, whilethe work actually done in crushing stone is far greater. My inventionallows, both at the top and bottom of the jaws, a greater stroke thancan be advantangeously used on existing machines known to me. p

I do not limit my invention to any definite number of jaws nor to anydetails and combinations provided these come fairly within the scope ofthe appended claims.

1. In a crusher, a pair of opposing jaws, one pivoted to crush objectsbet-ween them, at its upper portion and the other at its each jaw, meansconnecting each shaft to 1ts respective aw for oscillating the same,

and means for causing the jaws to operate toward and from each other inunison.

2. In a crusher, a pair of opposing jaws, a pair of driving shafts,means connecting one shaft to the upper portion of one of the jaws tocause its crushing movement toward and from the opposite jaw, meansconnecting the other shaft to the lower portion of one jaw to cause itscrushing movement toward and from the opposing jaw, and means forcausing the said jaw portions to move toward and from each other inunison.

Signed at Pittsburgh, Pa., this 6th day of March, 1911.

JOHN P. FOX. Witnesses F. N. BARBER, ANNA R. BEATTY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

